Link pivot removing tool



DeC- 23, 1952 G. A. sJosTRoM ET AL 2,622,389

LINK PIVOT REMOVING Toor.

Filed Nov. 24, 195o MNM mi IN V EN TOR5` Gmac-.z A SJosTnoM 3g EY@-Tneooom: ANYBERG Patented Dec. 2 3, ,1952

LINK PIVOT REMGVING TOOL George A. Sjostrom and Theodore A. Nyberg,Auburn, Maine Application November 24, 195o, serial ria-197,369

. 1 Claim.

This invention relates to tools for severing sprocket chains, and moreparticularly to an improved implement for separating the links of asprocket chain in an easy and rapid manner.

A main object of the invention is to provide a novel and improvedlsprocket chain-severing tool which is very simple in construction,which is easy to use, and which is adapted to rapidly remove theconnecting rivet employed between adjacent sets of links of a sprocketchain.

A further object of the inventionis to provide an improved sprocketchain-severing tool which is relatively inexpensive to manufacture,which involves only a few parts, which is very sturdy in construction,and which enables a sprocket chain to be severed rapidly, whereby saidsprocket chain may be repaired or varied'in length.

Further objects and advantages of the invention will become apparentfrom the following description and claim, and from the accompanyingdrawings, wherein:

Figure 1 is a top plan View of an improved chain-severing too-l'according to the present invention, showing a Vportion of' a sprocketchain mounted therein;

Figure 2 is a front end elevational View of the tool of Figure 1;

Figure 3 is a vertical cross-sectional view taken Aon the line 3 3 ofFigure 2;

Figure 4 is a cross-sectional detail View taken on the line -li ofFigure 3;

Figure 5 is a cross-sectional detail view taken on the line 5 5 ofFigure 3;

Figure 6 is a fragmentary side elevational view of the chain-grippingportion of the tool of Figure l, said chain-gripping portion being shownin open position;

Figure l is a fragmentary perspective View showing the main portions ofthe tool of Figures 1 to 6, the clamping arm being shown separated fromthe 'body of lthe tool.

Referring to the drawings, the chain-severing tool is designatedgenerally at I I. Said tool comprises a block member I2 to the bottom ofwhich is rigidly secured a depending rigid handle loop I3. The blockmember I2 is formed with a pair of spaced grooves i5 and I5 adapted toreceive the side links of a standard sprocket chain, the grooves I5 andI5 defining therebetween a rib IB which is adapted to extend between theopposing side links of the sprocket chain above mentioned. One side ofthe block member I2 is formed with the upstanding abutment member I1which is formed with the transverse slot ,I8 defining the spaced,parallel, transverse rib 2 members I3, I9'. The ri'b i5 is formed with atransverse central groove 20. Designated at `2I is an opstanding wallelement extending parallel to the rib I5 and located at the forward'endof the block member I2. The top edge of the wall element 2| is formedwith a groove 22 of semicircular cross-section which is in alignmentwith the groove 2i! of the rib I3, as shown in Figure 7.

Designated at 23 is an arm having a shank portion 24 which is receivedbetween the transverse walls I9 and I9', and which is pivotallyconnected to said walls by a transverse pivot pin 25. The arm 23 has adepending rib 26 adapted to engage the rib IG in overlying relation tothe groove 2li and the end of the arm 23 is formed with a depending rib2l adapted to engage the rib ZI in overlying relation to the groove 22.Rib 23 is formed with a semicircular notch or groove 29 adapted to matewiththe semicircular notch 2B to define a seat for receiving the roller33 of the sprocket chain at the point at which the chain is to besevered, as shown in Figure 3. The rib 2l is formed with a semicircularnotch 3| adapted to mate with the notch 22 to dene a circular openingaligned with the seat dened by notches 20 and 29.

Designated at 32 is a tubular guide member which is formed with areduced portion 33 extending transversely into and threadedly engaged inthe block I2 at the abutment Il. The shank portion 33 is formed with anaxial bore 34 which is axially aligned with the semicircular notches 2Qand 22. Designated at 35 is a rod member which is threadedly engagedinside an enlarged bore portion 36 provided in the tubular member 32,said rod 35 having rigidly secured thereto an axial pin member 37 whichis slidably received in the bore 33. Secured to the ends of the rod 35is a crank handle 3S which is rotatable to advance the rod 35 in thetubular member 32, whereby the pin 3l may be forced against thefastening rivet associated with the chain roller 33, thereby exertingaxial thrust on the rivet. By applying continued torque to the crankhandle 38, the rivet, shown at 39, may be forced out of the roller 30through the opening donned by the mating notches 22 and 3 I.

Designated at BE) is an arm rotatably mounted on the reduced portion 33of the tubular member 32 between the block I2 and the shoulder definedbetween the main body portion of mem- 'ber 32 and the reduced portion 33thereof. The arm it is formed with a radial projection 4I having acamming surface 32 engageable with a l2ip 3 on the end of the shankpor-tion 23 of arm In using the tool, the chain is placed in the blockmember I2 with the side links thereof received in the grooves l5 and I5and the roller 30 at the point at which the chain is to be severedreceived in the notch 20. The arm 23 is then swung into overlyingrelation with respect to the chain and is locked in overlying positionby rotating arm 40 to engage the camming element 4| with the lip 43 ofthe shank 24. It will be apparent that with the arm 40 in the positionshown in Figures 3 and 4, the element 4l binds securely beneath the lip43 and frictionally interlocks with the lip 43. This maintains the arm23 in clamping engagement with the roller 3D. With the chain thusgripped between arm 23 and the body l2, the hand crank 38 is rotated toadvance the threaded rod 35 in the tubular member 32, whereby the pin 31exerts axial thrust against the rivet 39 of the chain and forces saidrivet outwardly through the opening dened by the mating semcircularnotches 22 and 3 l.

It Will thus be apparent that a chain may be rapidly and easily severedat any desired point thereon by the use of the tool in the manner 'abovedescribed. It will be noted that the side links of the chain arereceived in the grooves l5 and I5', and are snugly held therein whilethe crank rod 35 is rotated. There is, therefore, no need for anchoringor clamping the sprocket chain in the block member I2 in any othermanner than the one above described, namely, by means of the arm 23 andthe locking arm 40, and the operator merely holds the handle loop I3with one hand while rotating the crank handle 38 with the other hand.

While a specific embodiment of an improved sprocket chain-severing toolhas been disclosed in the foregoing description, it will be understoodthat various modifications Within the spirit of the invention may occurto those skilled in the art. Therefore, it is intended that nolimitations be placed on the invention except as dened by the scope ofthe appended claim.

What is claimed is:

A sprocket chain severing tool of the character described comprising ablock member formed with :a groove, a longitudinal rib in said groovedisposed between the side Walls of the groove and denning a seat adaptedto receive a sprocket chain, said rib being formed with a transversegroove adapted to receive a roller of said chain, a transverse tubularguide member carried by the block member at one side thereof and alignedwith said transverse groove, a crank rod threaded into said tubularguide member, a pin member carried by the end of the crank rod andextending axially in the bore of said guide member, said -pin memberbeing adapted to abut the end of the rivet contained in said chainroller responsive to rotation of the crank rod, whereby the rivet may beforced out of the chain, a transverse arm pivoted to said block memberin the same transverse plane as said transverse groove and arranged toat times overlie said transverse groove, said arm being formed withrespective recesses arranged to receive said roller and the side linksof the chain, a detent arm pivoted to said tubular guide member, andcamming means on said detent arm lockingly engaging said transverse armwhen the transverse arm is in overlying relation to said transversegroove.

GEORGE A. SJOSTROM.

THEODORE A. NYBERG.

REFERENCES CITED The following references are of record in the nle ofthis patent:

UNITED STATES PATENTS Number Name Date 1,000,867 Widmayer et al. Aug.15, 1911 1,436,429 Bean Nov. 21, 1922 1,469,594 Harley Oct. 2, 19232,091,780 Horton Apr. 31, 1937 FOREIGN PATENTS Number Country Date17,825 Great Britain July 28, 1914 133,589 Great Britain Oct. 16, 1919922,820 France Feb. 10, 1947

